i have the 99 ls1 and when i check fuel pressure its aroung 85-90 psi itss flooding the engine making it run poorly.I talked to th guys at S&P and he told me if i was installing the ls1 in a 96 or newer and i had the older 99 ls1 that i could run my stock setup.i have a supply and return on my engine but i am getting nothing on the return side.ANY suggestions THANKSSSSSS Timmy